Abstract
Vinyl acetate was polymerized using high concentrations of 1-azobisphenyl-ethane (APE) as the initiator. Its polymerization rate was 30 times slower than that initiated by 2,2′-azobisisobutyronitrile, although the production rates of primary radicals were the same for both initiators. Such a slow rate can be explained kinetically on the assumption that the rate constant (ki) for the addition of phenylethyl radicals to the monomer is much smaller than the propagation rate constant (kp), where kti/kikp=6.07×10−11exp (12500/T) dm3 mol−1 s−1, (kti, primary radical termination rate constant and T, absolute temperature). The molecular weights of the polymers were controlled by the transfer of propagating radicals to APE where the transfer constant was estimated to be CtrC=31exp(−1860/T).
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Ito, K. Kinetics of Radical Polymerization of Vinyl Acetate Initiated by 1-Azobisphenylethane. Polym J 16, 139–144 (1984). https://doi.org/10.1295/polymj.16.139
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DOI: https://doi.org/10.1295/polymj.16.139